Internal-combustion engine.



c. w. SNYDER.

INTERNAL COMBUSTION ENGINE- APPLIOATION FILED APR:20.1907.

Patented Apr. 13, 1909.

2 SHEETS-SHEET 1.

Hi ll h IVE/VTOH Czarzeamzytzel' B y A TTORNEYS fro cl'bwrete G. W.SNYDER.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR. 20,1907.

@1 21 1 Patented Apr. 13, 1909.

2 SHEETS-SHEET 2i WITNESSES INVENTO/T v lazZes/lg izyder ATTORNEYSUNITED STATES *reornivr OFFICE.

CHARLES WIGHT SNYDER, OF HUDSON, NEW YORK.

INTERNAL-COMBUSTION ENGINE.

To all whom it may concern:

Be it known that I, CHARLES VIGHT bxroicu, a citizen of the UnitedStates, and

a resident of Hudson, in the county of 00-] -more. completely scavengedfrom the cylinider at. the end of the explosion stroke and the freshcharge more effectively admitted thereto.

The invention consists in certain features of construction andcombination of parts, all of which will be fully set forth hereinafterand particularly pointed out in the claims. I Reference. is to be had to.the accompanying drawings forming a part of. this specification, inwhich similar characters of referenceindicate corresponding parts in allthe ligures, and in which- Figure 1 is a side elevation of an engineconstructed in accordance with myyinvention; Fig. 2 is a centralvertical section taken on the line 22 of Fig. 1; Fig. 3 is a transversesection taken on the line 33 of Fig. 2, the piston beingremoved; andFig. 4 is a detail section similar to a portion of Fig. 2, but showingthe parts in a diiferent position.

In my improved engine I provide a cylin-.

der 10 of anysuitable form and provided with a jacket Her other suitablemeans for cooling. The cylinder is connected toany Suitable form ofcrank case 12, within which operates the crank 13 and the piston rod 14;

the latter being connected to any suitablei form of piston 15 mountedwithin the cylinder. All of theparts above referred to may beconstructed according to any well known design, inasmuch as the detailsthereof'conf stit-ute no portion of my invention.

The en ine is preferably so constructed that the esh charge iscompressed in the crank case before being delivered to the workingcylinder, and to permit of this I provide a suitable inlet pipe '16leading from l the carbureter, not shown, to the crank case, an'd fromthe crank case a conduit 17 leads to the inlet port of the workingcylinder.

a third Specification of Letters Patent. Application filed. April 20,1907.

Patented April 13, 1909.

Serial no. 369,240.

directly with the atmosphere, whereby only.

pure air is compressed in the crank case, and the conduit 17 may leadthrough the carbureter on its way to the inlet port, or may have meansfor delivering the liquid fuel thereto. The cylinder is provided with aninlet port 18 and an exhaust port 19 in the walls thereof, and bothportsare preferably so located that they are uncovered by the piston ator adjacent the end of its working stroke, although the inlet port may,if desired, be formed at the opposite end of the cylinder and adjacentthe spark plug 20. In the form of the invention illustrated in theaccompanying drawings, the inlet port 18 and the exhaust port 19 are onopposite sides of the cylinder and are adapted to be uncoveredsimultaneously by the piston. The face of the piston is provided with anupwardly cylinder before being permitted to escape through the exhaustport.

' In the specific form of my invention illustrated inthe accompanyingdrawings, I provide means whereby either air or an explosive mixture maybe admitted through a single inlet port, and whereby. this port or thetwo separate conduits leading thereto may be so controlled that at theend of the explosion stroke the exhaust port is opened,

fresh air is admitted toforce out the exhaust gas, and then the freshcharge is admitted.

Adjacentthe inlet port I provide a rotary three-way valve 22 adapted tocontrol the passage through the inlet port 18, through the conduit 17leading from the crank case or other explosive mixture compressor, and

assa e through a conduit 23 communicating with the outside atmosphere orwith any suitable air compressor. This valve is preferably cylindricalin form at 1ts ends, and intermediate its ends it. is cutaway to form acrescent-shaped portion 24 and adapted to place the inlet port 18 incommunication with either the air passage 23 or the fuel mixture conduit17. Th s valve 1s provided with a journal.- 25v at one end thereofhaving a bearing inthe wall of the valve casing 30,

andhaving a shaft- 26 extending out through the engine frame at theopposite side and supporting a sprocket or gear wheel 27. This sprocketor gear wheel is operatively each revolution of the crank shaft.

The inlet port 18 is preferably upon substantially the same level as theexhaust port 19, whereby they are uncovered simultaneously. The valve 22and its valve casing,30 are preferably located closely adjacent theinlet port 18, and the valve casing is cut away --to leave a recess 31adjacent the passage leading to the inlet oft 18, whereby the va ve willnot' be close closes said port.

In the operation of my improved engine, the arts will occupy thepositions indicated in ig. 2 just before the end of the exhaust stroke,and the exhaust port 19 will be uncovered by the piston 15, whereby theex haust gases can escape, but even though the inlet port 18 is open,the valve 22 is not rotated to a sufficient extent to permit of theescape of the exhaust through the conduit 23. Most of the exhaust gasesescape at this instant, and as the piston pro resses a sli htly greaterdistance, the rotation of the va ve opens the conduit 23, and theinertia of the gases passing through the exhaust port 19 and the conduitor mufller connected thereto, causes a suction and fresh air isdrawn'inward through the port 18 andinto the engine cylinder. If thisinertia or suction is not s'ufliciently great, a compressor generating asmall pressure, as, for instance, one-half to one pound, may beconnected to the conduit 23, or a suction fan ma be connected to theexhaust port 19. As t e piston travels to the end of its stroke the ort19 is completely uncovered and the con uit 23 is opened and in freecommunication with the interior of the c linder, at which'time thecylinder is comp etely scavenged, the parts occupyin lmes 1n 1g. 4. Asthe piston starts upon the return stroke, the conduit 23 is uicklyclosed and by the time the piston reac es the i position shown in dottedlmes in Fi 4, the

.valve is rotated to its osition, also s own in dotted'lines, and theinterior of the engine cylinder is in free communication with theconduit 17. At this time the explosive mixture which has been compressed1n the crank case is forced upward into the engine cylinder until thepiston is moved up to a suflicient distance to shut off communication,the recess 31 preventin the valve from closing before the .port. e comression, ignition and explosion are'then e ected as in an ordinaryinternal combustion engine. As the valve 22 rotates twice during eachrevolution of the main shaft 29, it is evident that the conduits 23 and17 are successively before the plston 1 the positions indicated insolidplaced in communication with the inlet ort iston at this time, therotation'o the valve is immaterial.

As the accompanying drawings illustrate 7 only one embodiment of myinvention, it is evident that various changes may be made in theconstruction thereof and within the scope'o'f the appended claims,without departin from the spirit ofthe invention;

In t e foregoing specification and in the claims, the term explosivemixture is used to designate the fluid delivered from the crank casethrough the conduit 17, but.

by the term. explosive mixture I do not wish to be limited to a mixturehaving the exact and thegretic'al proportions for producing perfectcombustion. It may be desirable to deliver a somewhat richer mixturethrough the conduit 17 than is normally desirable in an engineicylinder,as the air admitted through the conduit 23 and remaining. in thecylinder will serve to dilute the charge.

Having thus described my invention, I claim as new and desire to secureby Letters Patent '1. In an internal combustion engine, a Workingcylinder having anexhaust port, an .air delivery conduit and an exlosive mixture conduit communicating wit said cylinder, anda singlevalve at thejunction ot' said conduits for o ening and closing saidconduits independent y and in succession.

2. In an internal combustion engine, a workin' cylinder having a singleinlet port, an exp osivemixture delivery conduit, and means operatin toestablish communication between said in ct port and the outsideatmosphere and between said inlet portand said explosive mixturedelivery conduit in succession.

3. In an internal combustion engine, a

working cylinder having anexhaust port and a sing e inlet port, a pistonfor controlling said exhaust port, an explosive mixture conduitcommunicating with said inlet port, an air delivery conduitcommunicating with said inlet port-and with a source of air supply underatmospheric pressure, and. means independent of the piston for admittingair under atmospheric pressure and an ex losive mixture undercompression throng said inlet port after said exhaust port 1sopened,.whereby the inertia of the exhaust gases'in escaping from saidexhaust port draws in air under atmospheric pres-. sure prior to-theadmission of the explosive mixture under compression.

' inlet port in succession after the 'exhaust' 4, In an internalcombustion engine, a working cylinder having an lnlet ort and an exhaustport, means for control mg said last-mentioned port, and means for admitting air under atmospheric pressure and ex; ploslve mlxture undercompression to sand port is opened, whereby the inertia of the exhaustgasesin escaping from said exhaust port draws in alr under atmosphericpressure prior to theadmission of the explosive mixture undercompression. p

In an internal combustion engine, a

working cylinder havin an inlet ..port, a

piston within said cylin'er and adaptedto control said port, anair'delivery conduit and an explosive mixture conduit commufnicatingwith said port, and means independent of the piston for opening andclosing said conduits in succession.

6. In an internal combustion engine, a

' working cylinder having an inlet port, a

pistonwithin said cylinder and adapted to control said port, an airdelivery conduit and an'explosive mixture delivery conduit communicatingwith said port, and means foropening saio conduits in successionfwhilethe inlet port is uncovered by the pistonj 7. In an internal ,combustionengine, a

working cylinder halving an inlet port, a

and means for rotating said valve to open the conduits duringthe finalportion of the explosion stroke'and the first portion of the compressionstroke.

9. An internal combustion engine having" a working cylinder provided,with an inlet port and an exhaust port, a piston within said cylinderand adapted to control both of said ports, a crank case adapted to serveas a compression chamber, a conduit leading from said crank case to saidinlet port, a second conduit communicating with said inlet port, and arotary valve adjacent said inlet port and adapted to 'open' and closesaid conduits in succession while the inlet portisuncovered by thepiston. v

10. In a two-cycle, internal combustion engine, a working cylinderhaving an exhaust port and an inlet port, a piston for controlling bothof said ports, a chamber communicating with said inlet port, an airdelivery conduit communicating with said chamber, and an explosivemixture conduit communicatingwith sald chamber. and valve mechanism for.controlling said conduits.

.11. In a two-cycle, lnternal combustion engine, a Working cylinderhaving an exhaust port and an inlet port, a piston for controlling--both of said ports, a chamber communicating with said inlet port, anair deliveryjconduit communicating with said chamber, an explosivemixture conduit communicating with said chamber, and valve mechanism forcontrolling the communica-- tionbetween said conduits and said chamber.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES WIGHT SNYDER. Witnesses: H. HADLEY SMITH, J L. D. SMITH.

